Chapter 4. Peripheral Circuits; Power Supply Circuit; Main Power Supply (Vm, Vbridge); Gate Drive Power Supply (Vdrv, Vcp) - Renesas RAJ306102 User Manual

Solution starter kit motor control evaluation system

Hide thumbs

Table Of Contents

Table of Contents

RAJ306102 RSSK User's Manual

4.1

Power Supply Circuit

4.1.1

Main Power Supply (VM, VBRIDGE)

The Evaluation Board operates by supplying a single power supply of 6 to 48[V] between the J1 (VM,

VBRIDGE connection terminal) and J4 (GND connection terminal).

attached motor, refer to 4.3.4 Motor and supply the voltage according to the motor within the operating range

of RAJ306102. In addition, a fuse is mounted between TB1 and TB2 of Evaluation Board. Replace the fuse

capacity according to the motor drive current. When using external MOSFET board and shunt resistor

mounted on the Evaluation Board, refer to 4.3.1.1 MOSFET and connect the external MOSFET board power

and GND to J2 and J3 respectively.

Note.1: When using the attached motor, 24[V] ± 10[%] should be supplied.

4.1.2

Gate Drive Power Supply (VDRV, VCP)

The gate drive power supply (VDRV, VCP) of Evaluation Board is generated by the buck switching regulator

and charge pump of the smart gate driver.

The output voltage of the low-side gate drive power supply (VDRV) can be adjusted from 5[V] to 15[V] by the

bleeder ratio (R2 / R3) of the external feedback resistors shown in Figure 4-1. These resistances on the

Evaluation Board are R2 = 48.7[kΩ] and R3 = 3.48[kΩ], so the VDRV output voltage is 12[V]. For details of the

components for buck switching regulator, refer to 5.1.3 in the "RAJ306102 User's Manual: Hardware

(R18UZ0082EJ)".

The output voltage of the high-side gate drive power supply (VCP) is main power supply (VBRIDGE) + VDRV

[V]. For details on the components for charge pump output capacitor (C9), pumping capacitor (C4), refer to

5.1.4 in the "RAJ306102 User's Manual: Hardware (R18UZ0082EJ)".

R12UZ0130EJ0100

Rev.1.00

Nov 1, 2023